Electronic Proceedings of the Twenty-first Annual International Conference on Technology in Collegiate Mathematics

New Orleans, Louisiana, March 12-15, 2009

Paper R016

This is an electronic reprint, reproduced by permission of Pearson Education Inc. Originally appeared in the Proceedings of the Twenty-first Annual International Conference on Technology in Collegiate Mathematics, ISBN 0-321-68983-6, Copyright (C) 2010 by Pearson Education, Inc.

Five-pointed Stars and Escher's Reptile Drawings through Course Management System with Sketchpad

Vesna Kilibarda

In a geometry course we use a course management system, Oncourse, to help collaboration among students. Geometer's Sketchpad explorations are required. We present explorations of the golden ratio by a group of students fascinated by the symmetry of five-pointed stars. We conclude with a re-creation of an Escher drawing.